<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>React App - Hello World</title>
    <!-- You can include any CDN React libraries here for a standalone example -->
    <script crossorigin src="https://cdnjs.cloudflare.com/ajax/libs/react/18.2.0/umd/react.production.min.js"></script>
    <script crossorigin src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/18.2.0/umd/react-dom.production.min.js"></script>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            background-color: #f5f5f5;
        }
        #root {
            text-align: center;
            padding: 2rem;
            background-color: #ffffff;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            max-width: 500px;
            width: 100%;
        }
        h1 {
            color: #4a90e2;
        }
        p {
            color: #666;
            margin-bottom: 20px;
        }
    </style>
</head>
<body>
<div id="root">
    <h1>Hello, World!</h1>
    <p>This is a simple React application running in Spring Boot.</p>
    <p>If you're seeing this message, your application is running correctly!</p>
</div>

<!-- For a real React app, you would typically include your bundled JS here -->
<!-- <script src="app.bundle.js"></script> -->
</body>
</html>